About April's Birthstone: The diamond, aka "Tears of the gods" was believed to give victory and courage to its bearer when bound to his/her left arm. Kings were known to wear diamond studded armor in battle. Plato believed diamonds were living beings, embodying celestial spirits. Hindus believed diamonds were formed from lighting that struck rocks. Diamonds are the suggested gift for the 10th, 30th, 60th and 80th wedding anniversary.